The Greenwood

The Greenwood enters the battlefield tapped.
{t}: Add {g} to your mana pool.
{1}{g}{g}, {t}: Create a 1/1 green squirrel creature token with reach, a 1/1 green bird creature token with flying and a 2/2 green rabbit creature token with haste.
At the beginning of each end step, if there is a black creature with power or converted mana cost
5 or greater, transform The Greenwood.